Extraction of mutual inductance between EMI filter components

The mutual inductance between components directly affects the performance of EMI filters. This paper presents a method of converting the S-parameter of the network into impedance parameter and extracting mutual inductance from it. The extraction method of mutual inductance between capacitors and between capacitor and inductor are introduced in detail by taking the one-stage filter as an example, and the accuracy of the extracted mutual inductance was verified through simulation. The proposed mutual inductance extraction method can be applied to the simulation design of EMI filters to improve the design efficiency and circuit simulation accuracy.